// Copyright (C) 2025 woodycpp
//
// This work is licensed under the Creative Commons Attribution-ShareAlike 4.0
// International License. To view a copy of this license, visit
// https://creativecommons.org/licenses/by-sa/4.0/
//
// You are free to:
//   * Share — copy and redistribute the material in any medium or format
//   * Adapt — remix, transform, and build upon the material
//
// Under the following terms:
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//   license,
//     and indicate if changes were made. You may do so in any reasonable
//     manner, but not in any way that suggests the licensor endorses you or
//     your use.
//   * ShareAlike — If you remix, transform, or build upon the material, you
//   must
//     distribute your contributions under the same license as the original.
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// In short: You must credit the original author (woodycpp, 2025) and share any
// derivative works under the same CC-BY-SA-4.0 license.

#include "add.h"
#include <gtest/gtest.h>

TEST(AddTest, PositiveNumbers) {
    EXPECT_EQ(Add(1, 2), 3);
    EXPECT_EQ(Add(2, 3), 5);
}

TEST(AddTest, NegativeNumbers) {
    EXPECT_EQ(Add(-1, -2), -3);
    EXPECT_EQ(Add(-2, -3), -5);
}

TEST(AddTest, MixedSignNumbers) {
    EXPECT_EQ(Add(1, -2), -1);
    EXPECT_EQ(Add(-1, 2), 1);
}

TEST(AddTest, ZeroValues) {
    EXPECT_EQ(Add(0, 0), 0);
    EXPECT_EQ(Add(0, 1), 1);
    EXPECT_EQ(Add(1, 0), 1);
}

TEST(AddTest, BoundaryValues) {
    EXPECT_EQ(Add(2147483647, 0), 2147483647);
    EXPECT_EQ(Add(-2147483648, 0), -2147483648);
}

TEST(AddTest, Overflow) {
    EXPECT_EQ(Add(2147483647, 1), -2147483648);
    EXPECT_EQ(Add(-2147483648, -1), 2147483647);
}